82640791 has 8 divisors (see below), whose sum is σ = 87632064. Its totient is φ = 77664000.

The previous prime is 82640773. The next prime is 82640801. The reversal of 82640791 is 19704628.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82640791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82640791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82640741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9531 + ... + 16003.

It is an arithmetic number, because the mean of its divisors is an integer number (10954008).

Almost surely, 2^82640791 is an apocalyptic number.

82640791 is a deficient number, since it is larger than the sum of its proper divisors (4991273).

82640791 is a wasteful number, since it uses less digits than its factorization.

82640791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7241.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 82640791 is about 9090.6980480049. The cubic root of 82640791 is about 435.5768820422.

The spelling of 82640791 in words is "eighty-two million, six hundred forty thousand, seven hundred ninety-one".